Walter Defecates in the Company Restroom,does Not Wash His Hands

Walter defecates in the company restroom,does not wash his hands thoroughly,and then uses the office coffee pot,transferring bacteria onto the handle of the pot.Marcia pours some coffee and then goes to her desk to eat a muffin,ingesting some of the bacteria she picked up from the coffee pot.What is the route of transmission of this infection?

A) fecal-oral
B) respiratory
C) urogenital
D) parenteral